UPDATE: The "Miss Shawl" described here is now admitted to be Beth Roche. Roche is now seen sporting a new plastic limb, now with a fake 'stabilizer' assembly attached for dramatic effect. It is not yet determined how much money Roache has scammed from people with this fake injury.
All, or nearly all, of the injuries sustained during the Boston Marathon bombing, were fake. There may have been some real injuries; but after many hours of careful examination by many dedicated investigators, a verified serious injury from the "bombs" has yet to be found.
For indisputable proof that an amputee actor was used to fake an injury at the Boston Marathon bombing, see - https://archive.org/details/CrisisActorsPreparingDoubleAmputee
For examples of other amputee actors in innocent and productive action, see - https://archive.org/details/AmputeeActorsHelpMakeBostonMarathonBombing
Though there has not appeared yet a single authentic shrapnel wound from this "shrapnel bomb", I am certain many innocent bystanders (actors not included as 'innocent') suffered hearing loss, anguish, emotional trauma, and disrupted lives from the perfidious act of staging the bombing. My sympathy goes to these victims. As to the designers and actors; I am certain many laws were broken, and felony frauds committed in doing so. It will not take long to figure out who they were.